July 2010 5 – 55
5 Errors Patterns
5.1 Introduction
Not all error conditions on the control or machine can be shown by error messages on the
monitor.
Therefore, this chapter gives you an overview of errors with notes and tips on how to proceed.
Static and nonstatic
errors
Errors can also be defined in the categories of static errors (e.g., interruption in the electrical
cabinet, defective unit) and nonstatic errors (e.g., loose connection, shielding problems,
interferences).
Naturally, static errors can be found more easily.
Sporadic and
nonsporadic
errors
Check whether you can reproduce a certain error on the machine at any time (nonsporadic error).
This assists you in troubleshooting.
The integrated log or the PLC logic diagram are some possibilities to investigate sporadic errors,
as well as the integrated oscilloscope.
5.2 Overview of Possible Error Patterns
The following table shows an overview of specific errors on the machine or control, possible
causes of the errors as well as measures for finding these errors.
The potential measures for finding and correcting the errors are described in more detail in the
corresponding chapters.
In case of errors that may lead to very high currents, e.g. ground fault or short circuit in
the drive, do not switch on the machine again!
First ensure that there are no defective units, cables, etc.
Then eliminate all ground faults and short circuits in the machine!
Where it is possible and useful, you may switch the control off and on (after several
seconds) to observe, whether the error is generated again afterwards.
Error Possible cause of error Measures for error
diagnosis and/or
corrective action
Descriptions in this
manual
The iTNC monitor remains
dark after the machine has
been switched on.
iTNC monitor defective
Power supply to monitor
defective
Power supply to MC
defective
Defective unit connected
to the control (short
circuit, etc.)
Check the visual display
unit BC
Check power supply to
MC
Disconnect defective or
suspicious units or cables,
See “Visual Display Unit”
on page 21 – 355
See “Power Supply” on
page 17 – 251
See “Error Localization by
Process of Exclusion” on
page 6 – 66
The control does not boot
completely (error messages
related to the booting
procedure may be
displayed).
Hard disk defective Exchange MC or HDR or
drive assembly.
See “Exchange of
HEIDENHAIN
Components” on page 28
– 523.
The Power interrupted
message cannot be
confirmed or the login
password cannot be entered
in a dual-processor control.
The key gets caught. Check the keyboard. See “Keyboard Unit” on
page 22 – 359.
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